Quote:
Originally Posted by radio nut
Why does only one tube (1ln5) have a Floating isolated socket and what could happen if its mounts were crap and it touched the tuning cap? Would this be some sort of short?
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Well look at the schematic. Both of the 1ln5s show a solid circle with a dashed circle inside. And one side of the filament is attached to the the case. I'm guessing these are metal tubes.
The socket is isolated for a reason. There are 2 - 1ln5s which one is isolated? That might be a clue.
On the schematic, is the 1ln5 between the IF transformers labeled 25 and 26 the one that is isolated? If that filament shorted it would directly affect the 1lb4 that is getting the high voltage on the filament.